PHP OOP remember me function error - php

Question

I've been following this tutorial by phpacademy on OOP Login and Register functions and I cant seem to be able to get the remember me function to work. I think the problem is that $user-> login(); doesnt pass any data but i cant seem to be able to fix it.
and here is a part of my init.php
if (Cookie::exists(Config::get('remember/cookie_name')) && !Session::exists(Config::get('session/session_name'))) {
$hash = Cookie::get(Config::get('remember/cookie_name'));
$hashCheck = DB::getInstance()->get('users_session', array('hash', '=', $hash));
if ($hashCheck->count()) {
$user = new User($hashCheck->first()->user_id);
$user-> login();
}
}
this is my User.php file
public function login($username = null, $password= null, $remember = false) {
if (!$username && !$password && $this->exists()) {
//problematic if statement removing $this->exists() gives me the error 'Trying to get property of non-object'
Session::put($this->_sessionName, $this->data()->id);
} else {
$user = $this->find($username);
if ($user) {
if ($this->data()->password === Hash::make($password, $this->data()->salt)) {
Session::put($this->_sessionName, $this->data()->id);
if ($remember) {
$hash = Hash::unique();
$hashCheck = $this->_db->get('users_session', array('user_id', '=', $this->data()->id));
if (!$hashCheck->count()) {
$this->_db->insert('users_session', array(
'user_id' => $this->data()->id,
'hash' => $hash
));
} else {
$hash = $hashCheck->first()->hash;
}
Cookie::put($this->_cookieName, $hash, Config::get('remember/cookie_expiry'));
}
return true;
}
}
}
return false;
}
public function exists() {
return (!empty($this->_data)) ? true : false;
}

Answer 1

These (partial)files work for me:
init.php:
if(Cookie::exists(Config::get('remember/cookie_name')) && !Session::exists(Config::get('session/session_name'))) {
$hash = Cookie::get(Config::get('remember/cookie_name'));
$hashCheck = DB::getInstance()->get('users_session', array('hash', '=', $hash));
if($hashCheck->count()) {
$user = new User($hashCheck->first()->user_id);
$user->login();
}
}
User.php: (the complete file I have)
<?php
class User {
private $_db,
$_data,
$_sessionName,
$_cookieName,
$_isLoggedIn;
public function __construct($user = null) {
$this->_db = DB::getInstance();
$this->_sessionName = Config::get('session/session_name');
$this->_cookieName = Config::get('remember/cookie_name');
if(!$user) {
if(Session::exists($this->_sessionName)) {
$user = Session::get($this->_sessionName);
if($this->find($user)) {
$this->_isLoggedIn = true;
} else {
}
}
} else {
$this->find($user);
}
}
public function update ($fields = array(), $id = null) {
if(!$id && $this->isLoggedIn()) {
$id = $this->data()->id;
}
if(!$this->_db->update('users', $id, $fields)) {
throw new Exception('There was a problem updating');
}
}
public function create($fields) {
if(!$this->_db->insert('users', $fields)) {
throw new Exception('There was a problem creating an account');
}
}
public function find($user = null) {
if($user) {
$field = (is_numeric($user)) ? 'id' : 'username';
$data = $this->_db->get('users', array($field, '=', $user));
if($data->count()) {
$this->_data = $data->first();
return true;
}
}
return false;
}
public function login($username = null, $password = null, $remember = false) {
if(!$username && !$password && $this->exists()) {
Session::put($this->_sessionName, $this->data()->id);
} else {
$user = $this->find($username);
if($user) {
if($this->data()->password === Hash::make($password, $this->data()->salt)) {
Session::put($this->_sessionName, $this->data()->id);
if($remember) {
$hash = Hash::unique();
$hashCheck = $this->_db->get('users_session', array('user_id', '=', $this->data()->id));
if(!$hashCheck->count()) {
$this->_db->insert('users_session', array(
'user_id' => $this->data()->id,
'hash' => $hash
));
} else {
$hash = $hashCheck->first()->hash;
}
Cookie::put($this->_cookieName, $hash, Config::get('remember/cookie_expiry'));
}
return true;
}
}
}
return false;
}
public function hasPermission($key) {
$group = $this->_db->get('groups', array('id', '=', $this->data()->group));
if($group->count()) {
$permissions = json_decode($group->first()->permissions, true);
if($permissions[$key] == true) {
return true;
}
}
return false;
}
public function exists() {
return (!empty($this->_data)) ? true : false;
}
public function logout() {
$this->_db->delete('users_session', array('user_id', '=', $this->data()->id));
Session::delete($this->_sessionName);
Cookie::delete($this->_cookieName);
}
public function data() {
return $this->_data;
}
public function isLoggedIn() {
return $this->_isLoggedIn;
}
}
?>

Answer 2

Maybe you are reading and setting different cookie. Change:
Cookie::put($this->_cookieName, $hash, Config::get('remember/cookie_expiry'));
To:
Cookie::put(Config::get('remember/cookie_name'), $hash, Config::get('remember/cookie_expiry'));